Description of the Abap dictionary

I am trying to query a SAP data dictionary via ERAPonnect ABAP API. The code below retrieves the table names and various field properties, but does not show the field description. Does anyone know why?

thank

REPORT  ZSELECTCOMMAND.
TABLES: DD02L,
    DD03L,
    DD02T, DD04T.

DATA: BEGIN OF tb_meta,
    tabname   TYPE  DD02L-tabname,
    fieldname   TYPE  DD03L-fieldname,
    datatype    TYPE  DD03L-datatype,
    leng        TYPE  DD03L-leng,
    decimals    TYPE  DD03L-decimals,
    position    TYPE  DD03L-position,
desc    TYPE  DD04T-ddtext,
    END OF tb_meta.
DATA utb_meta LIKE STANDARD TABLE OF tb_meta.
DATA: ln_meta LIKE LINE OF utb_meta, m1 TYPE i, m2 TYPE i.
SELECT
    tb~tabname
fld~fieldname
    fld~datatype    fld~leng
    fld~decimals    fld~position
x~ddtext
    INTO CORRESPONDING FIELDS OF TABLE utb_meta
FROM
    dd02L AS tb
INNER JOIN dd03L AS fld
    ON tb~tabname = fld~tabname
INNER JOIN DD04T AS x
ON fld~ROLLNAME = x~ROLLNAME
AND x~DDLANGUAGE = 'EN'
WHERE
    CONTFLAG IN ('A', 'C', 'S')  
    AND 
    APPLCLASS <> '' 
    AND 
    tb~TABNAME NOT LIKE '/%' 
    AND 
    tb~TABNAME NOT LIKE '%_BAK'
    AND
   tb~TABNAME = 'BSAK'.
*GET RUN TIME FIELD m1. 
loop at utb_meta into ln_meta.
    write:/ 
    ln_meta-tabname 
    && '>>' && ln_meta-fieldname 
    && '>>' && ln_meta-datatype
    && '>>' && ln_meta-leng
    && '>>' && ln_meta-decimals
    && '>>' && ln_meta-position
    && '>>' && ln_meta-desc.
endloop.